“天宫一号”目标飞行器结构模态试验方法

Method of structural modal test for Tiangong-Ⅰ target spacecraft

"天宫一号"目标飞行器结构初样模态试验的激励方式、模态参数的识别方法及试验结果的评估等都有其独到的地方。多点激励模态试验的关键在于激励位置的选择及考核输入激励力的相关性,识别耦合紧密的模态结果重点在于参数识别算法。文章从模态试验原理出发,对多点激励在"天宫一号"目标飞行器结构初样模态试验中的应用及耦合紧密的模态试验结果的识别方法进行了探讨和分析。

With a great number of subsystems and subassemblies in the Tiangong-I target spacecraft,its structural modal test would have special features in terms of the exciting mode,the identification of modal parameters,and the estimation of test results.The key to the multiple-input modal test is the location of the excitation force and the correlation of the input forces.The key to estimating the closely-coupled modal parameters is the algorithm.Based on the principle of modal test,this paper reviews problems in the application of experimental modal analysis（EMA） for the Tiangong-I target spacecraft,especially,the method of estimating closely-coupled modal parameters.